Parapsychology (from the Greek: παρά para, "alongside" + psychology) is the study of ostensibly paranormal events including extra-sensory perception, psychokinesis, and survival of consciousness after death. Parapsychologists call these processes psi, a term intended to be descriptive without implying a mechanism. Parapsychology is a fringe science because it involves research that does not fit within standard theoretical models accepted by mainstream science.

Parapsychological research involves a variety of methodologies including laboratory research and fieldwork, which is conducted at privately funded laboratories and some universities around the world though there are fewer universities actively sponsoring parapsychological research today than in years past. Such research is published in specialized parapsychological publications, though a smaller number of articles on parapsychological research have also appeared in more mainstream journals. Experiments conducted by parapsychologists have included the use of random number generators to test for evidence of psychokinesis, sensory-deprivation Ganzfeld experiments to test for extra-sensory perception, and research trials conducted under contract to the United States government to investigate the possibility of remote viewing.

Scientists such as Ray Hyman, Stanley Krippner, and James Alcock, among others, are critical of both the methodology used and the results obtained in parapsychology. Skeptical researchers suggest that methodological flaws provide the best explanation for apparent experimental successes, rather than the anomalistic explanations offered by many parapsychologists. To date, no evidence has been accepted by the scientific community as establishing the existence of paranormal phenomena. Active parapsychologists have admitted difficulty in getting scientists to accept their research , and science educators at the California State Board of Education have called the subject pseudoscience in their academic standards literature.